Vue3 | 知识点归纳
用法与概念
1、新特性总结
2、生命周期
3、ref, reactive, toRef, toRefs
4、双向数据绑定
6、数据通信
- defineProps:子组件接收父组件传值
<template> <div>{{childProps}}</div> </template> <script setup> // 获取父组件传入的props const props = defineProps({ childProps: { type: String, default: 'a' } }); </script>
- defineEmits:子组件向父组件触发事件
<template> <button @click="sendMessage"></button> </template> import { defineEmits } from 'vue' <script setup> // 定义emit const emit = defineEmits(["acceptMessage"]); const sendMessage = () => emit('acceptMessage', 'a') </script>
7、defineExpose
- 在父组件中调用子组件方法。(vue2 中通常使用$ref去获取子组件)
子组件: <script setup> const goSomePage = () => { window.location.href = 'https://a.b.cn' } // 暴露给父组件 defineExpose({ goSomePage }); </script> 父组件: <template> <button @click="goSomePage">跳转</button> <Child ref="child" /> </template> <script setup> import { ref } from "vue" import Child from "./Child.vue" const child = ref("child"); const { goSomePage } = child.value; </script>